The getrpcent_r(), getrpcbyname_r(), and getrpcbynumber_r() functions
are the reentrant equivalents of, respectively, getrpcent(3),
getrpcbyname(3), and getrpcbynumber(3). They differ in the way that
the rpcent structure is returned, and in the function calling
signature and return value. This manual page describes just the
differences from the nonreentrant functions.
Instead of returning a pointer to a statically allocated rpcent
structure as the function result, these functions copy the structure
into the location pointed to by result_buf.
The buf array is used to store the string fields pointed to by the
returned rpcent structure. (The nonreentrant functions allocate
these strings in static storage.) The size of this array is
specified in buflen. If buf is too small, the call fails with the
error ERANGE, and the caller must try again with a larger buffer. (A
buffer of length 1024 bytes should be sufficient for most
applications.)
If the function call successfully obtains an RPC record, then *result
is set pointing to result_buf; otherwise, *result is set to NULL.

On success, these functions return 0. On error, they return one of
the positive error numbers listed in ERRORS.
On error, record not found (getrpcbyname_r(), getrpcbynumber_r()), or
end of input (getrpcent_r()) result is set to NULL.

This page is part of release 5.00 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 GETRPCENT_R(3)